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potassium nitrate

potassium nitrate, chemical compound, KNO3, occurring as colorless, prismatic crystals or as a white powder; it is found pure in nature as the mineral saltpeter, or niter. (The name saltpeter is also applied to sodium nitrate, although less frequently.) It is slightly soluble in cold water and very soluble in hot water. Potassium nitrate is prepared commercially by the reaction of potassium chloride with sodium nitrate. When potassium nitrate decomposes (on heating) it releases oxygen; it has been used extensively as the oxygen-supplying component of gunpowder since about the 12th cent. It is also used in explosives, fireworks, model rocket propellants, matches, and fertilizers, as a preservative in foods (especially meats), and in the manufacture of nitric acid and of glass.

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saltpetre

saltpetre potassium nitrate, nitre. XVI. alt., by assim. to SALT, of †salpetre (XIV) — (O)F. salpètre — medL. salpetra, prob. for *sāl petræ ‘salt of rock’ (the substance being so named because it occurs as an incrustation on stones).

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saltpetre

saltpetre (Bengal saltpetre) Potassium nitrate.

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potassium nitrate

potassium nitrate See nitrates; saltpetre.

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saltpetre

saltpetre See NITRE.

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saltpetre

saltpetrecater, crater, creator, curator, data, debater, delator, dumbwaiter, equator, freighter, frustrater, gaiter, grater, gyrator, hater, later, legator, mater, negator, pater, peseta, plater, rotator, skater, slater, stater, tater, traitor, ultimata, understater, upstater, waiter •painter •taster, waster •gamester • aviator • tailgater •hesitater • shirtwaister •Akita, Anita, arboreta, beater, beta, Bhagavadgita, cheater, cheetah, Demeter, Dieter, dolce vita, eater, eta, Evita, excreta, fetor, granita, greeter, heater, Juanita, litre (US liter), Lolita, maltreater, margarita, meter, metre, Peta, peter, praetor (US pretor), repeater, Rita, saltpetre (US saltpeter), secretor, Senhorita, señorita, Sita, skeeter, teeter, terra incognita, theta, treater, tweeter, ureter, veleta, zeta •Batista, Dniester, Easter, feaster, keister, leister, quaestor •speedster •deemster, teamster •scenester • browbeater • windcheater •beefeater •millilitre (US milliliter) •decilitre (US deciliter) •centilitre (US centiliter) •kilolitre (US kiloliter) •ammeter • Machmeter •millimetre (US millimeter) •decimetre (US decimeter) •altimeter •centimetre (US centimeter) •nanometre (US nanometer) •micrometer, micrometre •decametre (US dekameter) •kilometre (US kilometer) • autopista •anteater

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